LInetHttp::LInetHttp

#include "ltwrappr.h"

L_VOID LInetHttp::LInetHttp(L_VOID)

L_VOID LInetHttp::LInetHttp(pszServer, pszUserName = NULL, pszPassword = NULL, nPort = 80)

Constructs and initializes the member variables of the LInetHttp object.

Returns

None.

Comments

LInetHttp::LInetHttp() is the default LInetHttp constructor. After calling the this constructor, a user must call LInetHttp::Connect to establish a connection before using other functions.

LInetHttp::LInetHttp(pszServer, pszUserName = NULL, pszPassword = NULL, nPort = 80) is a constructor for the LInetHttp object. It connects to the HTTP server. If both pszUserName and pszPassword are NULL, the connection is made anonymously.

A connection to an HTTP server must be established before using any other HTTP functions. If a connection is disconnected, via either LInetHttp::Disconnect or LInetHttp::~LInetHttp, then a connection must be re-established before any other HTTP functions are called. LInetHttp::Connect and LInetHttp::LInetHttp can be used to establish a connection with an HTTP server.

Required DLLs and Libraries

See Also

Example

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName
//This example for LInetHttp::LInetHttp(L_VOID)
// This will call the default constructor and destructor when it is out of scope
L_INT LInetHttp_LInetHttpExample_1()
{
   LInetHttp InetHttp;
   // other code
   return SUCCESS;
}
//-----------------------------------------------------------------------------------------------------------------------
/*This example for LInetHttp::LInetHttp(pszServer, pszUserName = NULL, pszPassword = NULL, nPort = 21)*/
// This example simulates posting a form to a web site
L_INT LInetHttp_LInetHttpExample_2(HWND hWndParent)
{
   L_INT       nRet;
   L_UINT      uStatus;
   HANDLE      pFile;
   NAMEVALUE   nv[2];
   LBuffer     Response;
   L_UINT      ulSize;
   DWORD       dwSizeWrite;
   nv[0].pszName = TEXT("email");
   nv[0].pszValue = TEXT("support@leadtools.com");
   nv[1].pszName = TEXT("name");
   nv[1].pszValue = TEXT("First Last");
   LInetHttp InetHttp(TEXT("www.leadtools.com"));
   // Checking if the connection failed
   nRet = InetHttp.GetErrorFromList ();
   if(nRet != SUCCESS)
   {
      InetHttp.DisplayError (hWndParent, TEXT("Can't connect to the HTTP web server"));
      return nRet;
   }
   nRet = InetHttp.OpenRequest (HTTP_POST, TEXT("/form.asp"));
   if(nRet != SUCCESS)
   {
      InetHttp.DisplayError (hWndParent, TEXT("Can't open a request"));
      return nRet;
   }
   nRet = InetHttp.SendForm (nv, 2);
   if(nRet != SUCCESS)
   {
      InetHttp.DisplayError(hWndParent, TEXT("Error while send the form"));
      return nRet;
   }
   uStatus = InetHttp.GetServerStatus ();
   // Checking if the an error occurred
   nRet = InetHttp.GetErrorFromList ();
   if(nRet != SUCCESS)
   {
      InetHttp.DisplayError (hWndParent, TEXT("Can't get the server status, the connection may refused"));
      InetHttp.GetResponse (&Response); 
      ulSize = (L_UINT) Response.GetSize();
      pFile = CreateFile(MAKE_IMAGE_PATH(TEXT("error.htm")), GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
      while(ulSize != 0) 
      {
         WriteFile(pFile, Response.Lock (), ulSize, &dwSizeWrite, NULL); 
         Response.Unlock ();
         InetHttp.GetResponse(&Response); 
         ulSize = (L_UINT) Response.GetSize ();
      }
      CloseHandle(pFile); 
      return nRet; 
   }
   if(uStatus == L_HTTP_STATUS_OK)
   {
      nRet = InetHttp.GetResponse (&Response);
      if(nRet != SUCCESS)
      {
         InetHttp.DisplayError (hWndParent, TEXT("Can't get the server reponse, the connection may refused"));
         return nRet;
      }
      ulSize = (L_UINT) Response.GetSize();
      pFile = CreateFile(MAKE_IMAGE_PATH(TEXT("output.htm")), GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
      while(ulSize != 0)
      {
         WriteFile(pFile, Response.Lock (), ulSize, &dwSizeWrite, NULL); 
         InetHttp.GetResponse(&Response);
         ulSize = (L_UINT) Response.GetSize ();
      }
      CloseHandle(pFile);
   }
   return SUCCESS;
}
/*************************************************************************
Here is a sample form.asp that can be used with this sample.
<%@ LANGUAGE="VBSCRIPT" %>
<HTML>
<BODY>
 <table>
  <tr>
   <td>Email:</td>
   <td><% Response.Write Request("Email")%></td>
  </tr>
  <tr>
   <td>Name:</td>
   <td><% Response.Write Request("Name")%></td>
  </tr>
 </table>
</BODY>
<HTML>
*************************************************************************/